<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    /* red green blue */
    p {
      /* color: blueviolet; */
      /* 00-ff -> 255 * 255 * 255 */
      color: #000000;
      color: #ffffff;
      color: rgb(246, 0, 0);
      color: rgba(246, 0, 0, 0.1);
    }
  </style>
</head>

<body>

  <p>this is color</p>

</body>

</html>